The Planets

Ten Functions

If signs are styles, planets are functions. Each one governs a department of the psyche, and its sign describes the manner in which that department operates.

This is where a chart stops being a birthday. Ten functions distributed across twelve signs, then placed in twelve houses, produces something specific enough to be worth arguing about.

The Sun and Moon are strictly not planets and are called luminaries. The tradition groups all ten together because the classification that matters here is functional rather than astronomical.

Fast, Slow and Generational

The single most useful thing to know about the ten is how fast they move, because it determines how personal a placement is.

The Moon changes sign every two and a half days, the Sun and inner planets roughly monthly, Mars every six weeks, Jupiter yearly, Saturn every two and a half years. All of those describe an individual.

Uranus takes about seven years to cross a sign, Neptune fourteen, Pluto between twelve and thirty. Everybody born within years of you shares those, so their signs describe a cohort rather than a person.

How the Outer Three Become Personal

Two things pull a generational planet into an individual chart. Its house placement, which depends on your birth time, and any close aspect it makes to a personal planet.

Neptune in your sign is shared with everybody born across fourteen years. Neptune on your ascendant is yours.

Without either, an outer planet is background. Reading its sign as a personality trait produces a description that fits several million people equally well.

The Discovery Problem

Uranus was found in 1781, Neptune in 1846, Pluto in 1930. Astrology is roughly two thousand years old, which means the tradition operated for most of its history with seven bodies and no gap where these should have been.

Their meanings were assigned after discovery, largely by association with the mythological names the astronomers chose. That is a genuinely awkward fact for any claim that the attributions are ancient.

Traditional astrologers often work with the visible seven only, which is internally consistent. Modern practice uses all ten. Both are defensible; presenting nineteenth-century attributions as ancient wisdom is not.

Rulership

Each sign has a ruling planet, and a planet placed in the sign it rules is traditionally read as operating at full strength.

The classical scheme gave each of the seven visible bodies one or two signs. The modern scheme reassigned Scorpio to Pluto, Aquarius to Uranus and Pisces to Neptune after they were discovered.

Both schemes remain in use and they produce different readings for those three signs. Knowing which one a source uses is worth more than knowing which one is correct, since that question has no answer.